import akka.actor._
import akka.pattern.ask
import akka.util.Timeout

import scala.concurrent.duration.DurationLong

object Main {

  implicit val timeout: Timeout = 5.seconds

  def main(arguments: Array[String]): Unit = {
    val system = ActorSystem()

    system.actorOf(Props(classOf[FooActor]), name = "foo")
    system.actorOf(Props(classOf[FooActor], "argument"), name = "bar")
  }

  class FooActor(foo: String) extends Actor {
    override def receive: Receive = {
      case BarMessage(bar) if bar % 2 == 0 => sender() ! BarMessage(bar / 2)
      case BarMessage(bar) => sender() ? BarMessage(bar - 1)
    }
  }

  object FooActor {
    def props(foo: String): Props = Props(new FooActor(foo))
  }

  case class BarMessage(bar: Int)
}